Monolith by Monoprice Liquid Platinum Headphone Amplifier by Alex Cavalli

Now in stock @ $699:

http://www.monoprice.com/products/search.asp?keyword=33305)

First review here: http://www.enjoythemusic.com/magazine/equipment/1018/Monoprice_Monolith_Liquid_Platinum_Headphone_Amplifier_Review.htm

TL;DR: "In terms of emotional gravitas and truly experiencing the music, it is tough to beat at any price."